Allow to disable read receipt on groups


#1

On a “big” group read receipts can become an issue, at least for paid/slow connections, since in a group of N members for every message you send you get N-1 read receipt. The switch of “Read receipts” could have 3 states:
1- disabled=no read receipts,
2- direct only= not enabled on groups,
3- enabled= enabled for groups also.